A new flocculant of Polymeric Iron Aluminum (HF) was prepared by using Al2O3,CaCO3, FeCl3 and study on the factors of effect the basicity of polymeric iron aluminum flocculant such as calcination temperature and acid-soluble time during polymerization .The optimum conditions for the synthesis was got through experiments:Al2O3/CaCO3=3:2, was 2h,Ca3(AlO3)2/HCl(g;mL)=5:16, was 1200 ℃,the dosage of FeCl3 ? 6H2O was 0.6g . Keywords：flocculant; Polymeric Iron Aluminum (HF); CTMP wastewater